Take the curl module and replace it with your existing module (If you have the 64bit version) i have replaved the module in the 32bit version, too. But then you need an other module. Use the TS (Thread Safe) version. I hope you use the 64bit version.

ensure you retart apache and mysql - if you're not sure how, a reboot will sort that. also check that extension=php_curl.dll are uncommented in your php.ini for both php and apache folder before restarting and that the dll file actually exists in your build.

It should give you information of your entire PHP configuration. Scroll through the installed libraries and see if cURL is there. If not, hit the Manual - http://php.net/manual/en/book.curl.php - and get it setup. The instructions there are pretty good.